:root {
    /* Theme 1: Midnight (Default) */
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --surface-hover: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.2);
    --border-color: #334155;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 24px;
}

[data-theme="paper"] {
    --bg-color: #f6f5f0;
    --surface-color: #ffffff;
    --surface-hover: #eae8df;
    --text-primary: #2d2a26;
    --text-secondary: #7a766c;
    --accent-color: #d97757;
    --accent-glow: rgba(217, 119, 87, 0.1);
    --border-color: #e5e3dc;
}

[data-theme="forest"] {
    --bg-color: #1c2b23;
    --surface-color: #26382e;
    --surface-hover: #31473a;
    --text-primary: #e8ecd7;
    --text-secondary: #a3b8a8;
    --accent-color: #8cb369;
    --border-color: #384d40;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

/* Typography & Utilities */
h1, h2, h3 { font-weight: 600; letter-spacing: -0.02em; }
.hidden { display: none !important; }
.accent { color: var(--accent-color); }

/* Buttons */
.btn {
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    border: none;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn.primary { background: var(--accent-color); color: #000; box-shadow: 0 4px 12px var(--accent-glow); }
.btn.primary:hover { transform: translateY(-1px); filter: brightness(1.1); }
.btn.secondary { background: var(--surface-hover); color: var(--text-primary); }
.icon-btn { background: transparent; border: none; color: var(--text-secondary); font-size: 1.5rem; cursor: pointer; padding: 8px; border-radius: 50%; transition: 0.2s; }
.icon-btn:hover { background: var(--surface-hover); color: var(--text-primary); }

/* Views */
.view {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Landing */
#view-landing { justify-content: center; align-items: center; text-align: center; }
.landing-content h1 { font-size: 3.5rem; margin-bottom: 1rem; }
.onboarding-card { background: var(--surface-color); padding: 2rem; border-radius: var(--radius-md); border: 1px solid var(--border-color); margin-top: 2rem; max-width: 400px; width: 90%; }
.onboarding-card input { width: 100%; padding: 12px; margin: 10px 0 20px; background: var(--bg-color); border: 1px solid var(--border-color); color: var(--text-primary); border-radius: var(--radius-sm); font-size: 1rem; }

/* Dashboard */
#view-dashboard { padding: 2rem; max-width: 1200px; margin: 0 auto; width: 100%; }
.dash-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1rem; margin-bottom: 3rem; }
.stat-card { background: var(--surface-color); padding: 1.5rem; border-radius: var(--radius-md); border: 1px solid var(--border-color); display: flex; align-items: center; gap: 1rem; }
.stat-card i { font-size: 2rem; color: var(--accent-color); }
.stat-val { display: block; font-size: 1.5rem; font-weight: 600; }
.stat-label { font-size: 0.85rem; color: var(--text-secondary); }

/* Room Layout */
.room-topbar { display: flex; justify-content: space-between; align-items: center; padding: 1rem 2rem; border-bottom: 1px solid var(--border-color); background: var(--bg-color); }
.room-code { font-size: 0.85rem; color: var(--text-secondary); background: var(--surface-color); padding: 4px 8px; border-radius: 4px; font-family: monospace; }
.room-layout { display: grid; grid-template-columns: 1fr 350px; flex: 1; height: calc(100vh - 70px); }

/* Timer Area */
.room-main { display: flex; flex-direction: column; align-items: center; justify-content: center; position: relative; padding: 2rem; }
.timer-container { text-align: center; }
.current-task { font-size: 1.2rem; color: var(--text-secondary); margin-bottom: 1rem; letter-spacing: 0.05em; text-transform: uppercase; }
.timer-display { font-size: clamp(6rem, 15vw, 12rem); font-weight: 700; line-height: 1; font-variant-numeric: tabular-nums; margin-bottom: 2rem; text-shadow: 0 0 40px var(--accent-glow); }
.timer-progress-bar { width: 100%; max-width: 400px; height: 4px; background: var(--surface-hover); border-radius: 2px; overflow: hidden; margin: 0 auto 2rem; }
.progress-fill { height: 100%; background: var(--accent-color); width: 100%; transition: width 1s linear; }
.timer-controls { display: flex; gap: 1rem; justify-content: center; align-items: center; }
.quick-actions { position: absolute; bottom: 2rem; display: flex; gap: 1rem; align-items: center; }
.reaction-btn { background: var(--surface-color); border: 1px solid var(--border-color); padding: 8px 12px; border-radius: 20px; cursor: pointer; transition: 0.2s; }
.reaction-btn:hover { transform: scale(1.1); background: var(--surface-hover); }
.status-indicator { font-size: 0.8rem; color: var(--text-secondary); display: flex; align-items: center; gap: 6px; }

/* Sidebar */
.room-sidebar { background: var(--surface-color); border-left: 1px solid var(--border-color); display: flex; flex-direction: column; }
.sidebar-tabs { display: flex; border-bottom: 1px solid var(--border-color); }
.tab-btn { flex: 1; background: none; border: none; padding: 1rem; color: var(--text-secondary); cursor: pointer; font-weight: 500; border-bottom: 2px solid transparent; transition: 0.2s; }
.tab-btn.active { color: var(--accent-color); border-bottom-color: var(--accent-color); }
.tab-content { flex: 1; overflow-y: auto; padding: 1rem; }

/* Participant Cards */
.participant-card { display: flex; align-items: center; justify-content: space-between; padding: 12px; background: var(--bg-color); border-radius: var(--radius-sm); margin-bottom: 8px; border: 1px solid var(--border-color); }
.part-info { display: flex; align-items: center; gap: 12px; }
.avatar { width: 36px; height: 36px; border-radius: 50%; background: var(--accent-color); display: flex; align-items: center; justify-content: center; color: #000; font-weight: bold; }
.part-name { font-size: 0.95rem; font-weight: 500; }
.part-status { font-size: 0.8rem; color: var(--text-secondary); display: flex; align-items: center; gap: 4px; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success-color); }
.status-dot.break { background: #f59e0b; }

/* Schedule Blocks */
.schedule-item { border-left: 3px solid var(--border-color); padding: 10px 15px; margin-bottom: 12px; }
.schedule-item.active { border-left-color: var(--accent-color); background: var(--bg-color); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.sch-title { font-weight: 500; margin-bottom: 4px; }
.sch-time { font-size: 0.8rem; color: var(--text-secondary); }

/* Chat */
.chat-messages { display: flex; flex-direction: column; gap: 12px; margin-bottom: 1rem; }
.chat-msg { background: var(--bg-color); padding: 10px; border-radius: var(--radius-sm); border-bottom-left-radius: 0; align-self: flex-start; max-width: 85%; }
.msg-author { font-size: 0.75rem; color: var(--text-secondary); margin-bottom: 2px; }
.msg-text { font-size: 0.9rem; }
.chat-input-area input { width: 100%; padding: 10px; background: var(--bg-color); border: 1px solid var(--border-color); color: var(--text-primary); border-radius: 20px; }

/* Toasts */
#toast-container { position: fixed; bottom: 20px; left: 20px; display: flex; flex-direction: column; gap: 10px; z-index: 1000; }
.toast { background: var(--surface-color); color: var(--text-primary); padding: 12px 20px; border-radius: var(--radius-sm); border: 1px solid var(--border-color); box-shadow: 0 4px 12px rgba(0,0,0,0.2); animation: slideIn 0.3s ease forwards; display: flex; align-items: center; gap: 10px; }
@keyframes slideIn { from { transform: translateX(-100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* Responsive Design */
@media (max-width: 900px) {
    .room-layout { grid-template-columns: 1fr; grid-template-rows: 1fr 300px; }
    .timer-display { font-size: clamp(4rem, 12vw, 6rem); }
}
@media (max-width: 600px) {
    #view-dashboard { padding: 1rem; }
    .room-topbar { padding: 0.5rem 1rem; }
    .room-layout { grid-template-rows: 1fr 250px; }
    .timer-controls { flex-wrap: wrap; }
}